Preparing for Use
R&S
®
CMW500
25User Manual 1173.9463.02 ─ 02
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To turn the power on or off, press the AC power switch to position I (On) or 0 (Off).
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See also Replacing Fuses.
After power-on, the R&S CMW500 is in standby or ready state, depending on the state
of the standby toggle switch at the front panel of the instrument when the instrument was
switched off for the last time, see Standby and Ready State.
The AC power switch can be permanently on. Switching off is required only if the instru-
ment must be completely removed from the AC power supply.
2.3.8 Replacing Fuses
The instrument is protected by two fuses (T10 IEC 127-2/V, stock no. 0606.3136.00)
located in the fuse holder to the right of the AC power switch on the rear panel.
Shock hazard
For fuse replacement, ensure that the instrument is switched off and disconnected from
the power supply by removing the plug from the AC and DC power connector.
To replace the fuses
1. Open the lid of the AC power connector.
2. Lift the fuse holder out of its slot.
3. Exchange the two fuses.
4. Put the fuse holder back in its slot and close the lid.
2.3.9 Standby and Ready State
The STANDBY toggle switch is located in the bottom left corner of the front panel.
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After switching on the AC power (see Power on and off), press the STANDBY key
briefly to switch the R&S CMW500 from the standby to ready state or vice versa.
In standby state, the right, amber LED is on. The standby power only supplies the power
switch circuits and the optional oven quartz (Timebase OCXO, option R&S CMW-B690A).
In this state it is safe to switch off the AC power and disconnect the instrument from the
power supply.
In ready state, the left, green LED is on. The R&S CMW500 is ready for operation. All
modules are power-supplied and the R&S CMW500 initiates its startup procedure. See
also Starting the Instrument and Shutting Down.
Putting the Instrument into Operation
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